 Its engines, which are built and serviced by H.W.A GmbH, have so far contributed to a total of four drivers' and four teams' championship titles in the Formula Three Euroseries and British Formula Three Championship.The H.W.A Mercedes-AMG M271 was based on a 1.8 litre 4-cylinder from the C-Klasse, bored out to the regulation 2.0 litre capacity.Formula Three engine regulations demand a naturally aspirated, 4-stroke, 4-cylinder, production-based specification, with a capacity of not more than 2,000 cc.